CSF 3518 Radiator

Brand	CSF 3518
Box Height (in)	6 5/8
Box Length (in)	37 15/16
Box Weight (lbs)	13
Box Width (in)	22 3/16
Cap Included	No
Core Length	28 3/8
Core Material	Aluminum
Core Thickness	7/8
Core Width	18 5/16
Down Flow Or Cross Flow Type	Cross Flow
Hazardous Material	No
Inlet Diameter	1 1/4 Left
Inlet Length (in)	19
Inlet Width (in)	1 5/16
Oil Cooler (in)	11 13/16 (high-efficiency Plate Type)
Outlet Diameter	1 1/4 Left
Outlet Length (in)	19
Outlet Width (in)	1 3/4
Radiator Core Row Quantity	1
Tank Material	Plastic
Tech Note	O.E.M. style Plastic tanks & Aluminum core;with quick-connect inlet & outlet pipe & quick-connect oil cooler fittings.
Product line	1 Row Plastic Tank Aluminum Core
Fits	Audi · 58 vehicles

OE-style construction. Plastic tanks and an aluminum core mirror original equipment design.

Cross-flow design. Promotes efficient coolant flow for consistent heat transfer.

Quick-connect fittings. Simplify hose and oil cooler connections during installation.

Cross-references APDI 8013188, Carlson 13188 and Spectra Premium CU13188 for the same application. See all 6.

$132.97Free shipping

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OE-Style Radiator for Audi Cooling Service

CSF Part Number 3518 is an OE-style radiator built with a plastic tank and aluminum core for select Audi applications. It is designed for direct replacement service on vehicles such as the Audi A4, A5, A6, Q3, and Q5, with fitment coverage across model years from 2009 through 2018.

The CSF 1 Row Plastic Tank Aluminum Core line focuses on factory-style construction and consistent cooling performance. This radiator uses a cross-flow design with quick-connect inlet and outlet pipe fittings, plus quick-connect oil cooler fittings for applications that require integrated transmission cooling.

Key Features

CSF Part Number 3518
1-row cross-flow radiator design
Plastic tank and aluminum core construction
Core thickness: 7/8 in.
Core size: 18 5/16 in. wide x 28 3/8 in. long
Inlet and outlet diameter: 1 1/4 in., left-side configuration
High-efficiency plate-type oil cooler section: 11 13/16 in.
OE-style plastic tanks with aluminum core and quick-connect fittings

Detailed Description

CSF manufactures radiators to high-performance standards using factory-oriented engineering and validation methods. This radiator is wind-tunnel tested for cooling performance validation and built in ISO/TSO-certified facilities. For Audi A4, A4 Quattro, A4 allroad, A5, A5 Quattro, A6, A6 Quattro, Q3, and Q5 applications, CSF 3518 provides the correct OE-style layout for straightforward replacement and dependable thermal management.

This part cross-references Spectra Premium CU13188 and APDI 8013188 for the same application.

What This Radiator Helps Address

Overheating caused by a leaking or restricted radiator
Coolant loss from cracked plastic tanks or aged seams
Reduced heat transfer from a clogged or damaged core
Transmission cooling concerns on applications with an integrated oil cooler
Fitment issues from non-OE-style replacement parts

Installation Notes and Tips

Verify inlet and outlet orientation before installation, since this radiator uses a left-side inlet and outlet configuration. Confirm the vehicle’s OE part number and cooling package details against the existing unit, especially on Audi models with an integrated oil cooler. Inspect hoses, clamps, and coolant condition during replacement to help prevent repeat cooling-system issues.

Quality Assurance

CSF states that its radiators are manufactured in ISO/TSO-certified facilities and validated through laboratory testing for cooling performance. The brand has supplied radiators worldwide for decades and offers a broad catalog covering many leading vehicle applications. Fits 2009-2016 Audi A4, N/A; Fits 2009-2016 Audi A4 Quattro, N/A; Fits 2010-2016 Audi A5, N/A; Fits 2010-2017 Audi A5 Quattro, N/A; Fits 2012-2017 Audi A6, N/A; Fits 2013-2015 Audi A6 Quattro, N/A; Fits 2010-2016 Audi Q5, N/A; Fits 2013-2016 Audi A4 allroad, N/A; Fits 2015-2018 Audi Q3, N/A.

This part fits 58 vehicles

Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

Year	Make	Model	Transmission	Liters	Cylinders	Position	Notes
2018	Audi	Q3	—	2.0L	L4	N/A	1 Row Plastic Tank Aluminum Core
2017	Audi	A5 Quattro	—	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2017	Audi	A6	—	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2017	Audi	Q3	—	1.4L	L4	N/A	1 Row Plastic Tank Aluminum Core
2016	Audi	A4	Automatic	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2016	Audi	A4 allroad	Automatic	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2016	Audi	A4 Quattro	Automatic	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2016	Audi	A5	—	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2016	Audi	A5 Quattro	—	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2016	Audi	A6	—	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2016	Audi	Q3	—	1.4L	L4	N/A	1 Row Plastic Tank Aluminum Core
2016	Audi	Q5	—	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2015	Audi	A4	Automatic	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2015	Audi	A4 allroad	Automatic	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2015	Audi	A4 Quattro	Automatic	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2015	Audi	A5	—	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2015	Audi	A5 Quattro	—	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2015	Audi	A6	—	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2015	Audi	A6 Quattro	—	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2015	Audi	Q3	—	2.0L	L4	N/A	1 Row Plastic Tank Aluminum Core
2015	Audi	Q5	—	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2014	Audi	A4	Automatic	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2014	Audi	A4	Automatic CVT	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2014	Audi	A4 allroad	Automatic	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2014	Audi	A4 Quattro	Automatic	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2014	Audi	A5	—	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2014	Audi	A5 Quattro	—	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2014	Audi	A6	—	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2014	Audi	A6 Quattro	—	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2014	Audi	Q5	—	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2013	Audi	A4	Automatic CVT	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2013	Audi	A4 allroad	Automatic	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2013	Audi	A4 Quattro	Automatic	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2013	Audi	A5	—	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2013	Audi	A5 Quattro	—	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2013	Audi	A6	—	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2013	Audi	A6 Quattro	—	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2013	Audi	Q5	—	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2012	Audi	A4	Automatic CVT	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2012	Audi	A4 Quattro	Automatic	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2012	Audi	A5	—	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2012	Audi	A5 Quattro	—	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2012	Audi	A6	—	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2012	Audi	Q5	—	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2011	Audi	A4	Automatic CVT	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2011	Audi	A4 Quattro	Automatic	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2011	Audi	A5	—	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2011	Audi	A5 Quattro	—	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2011	Audi	Q5	—	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2010	Audi	A4	Automatic CVT	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2010	Audi	A4	Automatic	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2010	Audi	A4 Quattro	Automatic	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2010	Audi	A5	—	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2010	Audi	A5 Quattro	—	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2010	Audi	Q5	—	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2009	Audi	A4	Automatic	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2009	Audi	A4	Automatic CVT	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2009	Audi	A4 Quattro	Automatic	2.0L	L4	N/A	OE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
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Directly replaces or cross-references 6 part numbers

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.

APDI — 8013188Carlson — 13188Spectra Premium — CU131888K0 121 251 AJ8K0 121 251 TAU3010145